Coleto Creek Park and Reservoir
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Coleto Creek Park and Reservoir clear sky chart from 2005-11-05 to 2017-09-24.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
54%
15339
23%
47034
18%
15293
59%
15293
30%
28376

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 15thNight
39%
898
23%
2327
11%
895
45%
895
29%
1546
January16th to endNight
40%
905
24%
2441
11%
905
47%
905
30%
1580
February1st to 15thNight
38%
704
25%
2110
12%
699
48%
699
25%
1338
February16th to endNight
33%
593
24%
1855
11%
593
44%
593
25%
1146
March1st to 15thNight
36%
540
25%
1980
14%
540
49%
540
21%
1239
March16th to endNight
41%
576
22%
2112
18%
576
49%
576
26%
1212
April1st to 15thNight
34%
539
19%
1977
12%
539
46%
539
23%
1186
April16th to endNight
35%
540
21%
1848
16%
540
44%
540
21%
1177
May1st to 15thNight
42%
539
19%
1620
14%
539
49%
539
27%
1057
May16th to endNight
56%
563
22%
1684
21%
561
61%
561
30%
1042
June1st to 15thNight
74%
540
19%
1620
22%
540
76%
540
40%
897
June16th to endNight
72%
540
16%
1620
18%
540
74%
540
31%
991
July1st to 15thNight
78%
510
18%
1530
20%
510
79%
510
35%
903
July16th to endNight
83%
564
19%
1594
23%
531
84%
531
39%
890
August1st to 15thNight
91%
539
26%
1628
29%
536
91%
536
53%
785
August16th to endNight
79%
573
17%
2033
22%
573
80%
573
31%
1161
September1st to 15thNight
80%
540
17%
1980
21%
540
80%
540
30%
1141
September16th to endNight
73%
519
25%
1914
28%
519
74%
519
29%
1081
October1st to 15thNight
76%
531
32%
1851
32%
531
77%
531
40%
938
October16th to endNight
67%
704
35%
2112
27%
704
70%
704
47%
1076
November1st to 15thNight
58%
700
26%
2100
20%
700
60%
700
33%
1263
November16th to endNight
51%
822
30%
2262
18%
822
58%
822
37%
1336
December1st to 15thNight
40%
900
24%
2340
13%
900
44%
900
25%
1636
December16th to endNight
37%
960
19%
2496
10%
960
41%
960
24%
1755

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
11%5%25%5%35%5%6%8%39%
47888
Night
11%42442445%8%47%
47232
TransparencyDay
41%7%11%17%14%7%
47588
Night
34%6%13%20%15%9%
47037
SeeingDay
11%318%30%24%10%
5297
Night
13%420%34%23%2
15342

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
22%5%25%6%33345%37%
1611
16th to endDay
15%7%24433345%44%
1794
February1st to 15thDay
19%6%23323245%45%
1750
16th to endDay
17%7%35%313346%43%
1617
March1st to 15thDay
21%6%25%41335%7%36%
1980
16th to endDay
13%6%25%43445%8%42%
2110
April1st to 15thDay
13%7%35%42445%7%42%
1971
16th to endDay
15%7%35%42445%6%38%
2109
May1st to 15thDay
11%6%37%5%35%46%8%36%
2331
16th to endDay
9%5%35%5%45%6%7%11%34%
2430
June1st to 15thDay
4325%6%47%7%7%10%39%
2340
16th to endDay
8%5%37%7%5%7%6%8%11%28%
2340
July1st to 15thDay
9%5%25%5%47%7%7%10%32%
2340
16th to endDay
5%435%7%47%6%9%11%32%
2466
August1st to 15thDay
2225%6%36%6%7%11%45%
2319
16th to endDay
8%5%36%6%46%7%7%10%31%
2167
September1st to 15thDay
8%6%37%8%46%6%6%7%32%
1980
16th to endDay
9%5%25%6%45%6%6%8%38%
1904
October1st to 15thDay
7%425%425%5%6%7%48%
1768
16th to endDay
8%415%413436%55%
1760
November1st to 15thDay
11%6%35%6%35%5%5%7%38%
1758
16th to endDay
13%5%25%42335%5%49%
1695
December1st to 15thDay
23%9%35%424336%33%
1620
16th to endDay
18%8%36%42445%5%36%
1728
January1st to 15thNight
20%6%24313246%44%
2327
16th to endNight
17%5%24313346%46%
2441
February1st to 15thNight
16%5%24424335%46%
2102
16th to endNight
14%6%24333346%47%
1855
March1st to 15thNight
17%6%24424347%42%
1980
16th to endNight
13%6%24323346%48%
2112
April1st to 15thNight
13%5%15%4245%6%8%41%
1977
16th to endNight
17%7%345%2335%7%39%
1848
May1st to 15thNight
10%5%25%5%35%46%9%40%
1619
16th to endNight
8%3245%346%7%12%41%
1683
June1st to 15thNight
4213335%5%5%10%52%
1620
16th to endNight
7%314335%8%7%11%42%
1620
July1st to 15thNight
4323435%48%12%46%
1620
16th to endNight
22135%3446%13%52%
1702
August1st to 15thNight
111221345%12%63%
1638
16th to endNight
5%3144235%6%12%47%
2033
September1st to 15thNight
6%324435%45%10%48%
1980
16th to endNight
8%4144335%6%9%48%
1914
October1st to 15thNight
5%313323447%59%
1851
16th to endNight
7%31321233466%
2112
November1st to 15thNight
11%42442445%7%49%
2100
16th to endNight
12%413213346%54%
2262
December1st to 15thNight
19%6%34424336%40%
2340
16th to endNight
18%8%35%424345%39%
2496

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
49%45%12%15%12%
1612
16th to endDay
42%46%14%19%12%
1794
February1st to 15thDay
42%46%14%17%15%
1751
16th to endDay
43%47%15%18%11%
1617
March1st to 15thDay
48%5%7%12%17%9%
1980
16th to endDay
40%5%10%15%16%11%
2112
April1st to 15thDay
41%6%9%15%17%10%
1971
16th to endDay
45%5%7%17%14%9%
2109
May1st to 15thDay
43%7%11%16%12%8%
2331
16th to endDay
41%8%12%19%14%3
2434
June1st to 15thDay
34%10%13%20%17%3
2340
16th to endDay
46%9%13%20%9%
2340
July1st to 15thDay
41%10%14%22%9%
2201
16th to endDay
37%12%20%25%3
2311
August1st to 15thDay
29%10%19%31%9%
2305
16th to endDay
44%12%15%19%5%1
2167
September1st to 15thDay
47%9%11%16%11%2
1980
16th to endDay
40%9%12%16%16%5%
1904
October1st to 15thDay
33%6%11%18%17%11%
1768
16th to endDay
30%47%15%23%17%
1760
November1st to 15thDay
42%6%10%12%17%10%
1758
16th to endDay
37%47%14%17%18%
1695
December1st to 15thDay
52%46%13%15%7%
1620
16th to endDay
48%5%7%13%15%8%
1728
January1st to 15thNight
42%37%15%17%14%
2327
16th to endNight
40%37%17%18%13%
2441
February1st to 15thNight
41%48%11%18%16%
2112
16th to endNight
39%5%6%17%19%12%
1855
March1st to 15thNight
42%6%8%14%17%11%
1980
16th to endNight
36%5%11%15%18%11%
2112
April1st to 15thNight
39%5%11%16%15%11%
1977
16th to endNight
45%410%17%12%10%
1848
May1st to 15thNight
39%7%13%16%12%9%
1620
16th to endNight
35%7%16%24%14%1
1685
June1st to 15thNight
25%7%15%27%21%2
1620
16th to endNight
32%9%20%28%9%
1620
July1st to 15thNight
27%10%23%32%5%
1530
16th to endNight
22%10%31%31%3
1594
August1st to 15thNight
14%7%28%42%5%
1628
16th to endNight
27%11%29%24%6%1
2033
September1st to 15thNight
30%9%21%23%12%2
1980
16th to endNight
31%7%14%24%15%5%
1914
October1st to 15thNight
24%5%12%26%18%12%
1851
16th to endNight
23%36%19%28%18%
2112
November1st to 15thNight
33%6%12%20%17%9%
2100
16th to endNight
31%410%15%18%19%
2262
December1st to 15thNight
46%47%18%13%8%
2340
16th to endNight
46%47%13%16%10%
2496

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
22%431%33%7%1
90
16th to endDay
25%6%35%21%10%1
96
February1st to 15thDay
11%13%35%27%11%1
90
16th to endDay
12%8%41%28%8%
81
March1st to 15thDay
34%234%18%8%1
90
16th to endDay
16%13%30%25%14%
96
April1st to 15thDay
14%14%31%30%8%1
90
16th to endDay
22%6%29%27%13%
219
May1st to 15thDay
11%9%44%24%9%
468
16th to endDay
12%5%31%30%17%1
517
June1st to 15thDay
7%111%39%31%9%
495
16th to endDay
9%113%34%28%13%
495
July1st to 15thDay
7%9%37%29%15%
475
16th to endDay
5%5%32%35%19%
515
August1st to 15thDay
2330%37%24%
472
16th to endDay
15%7%34%21%19%
207
September1st to 15thDay
7%228%41%20%
135
16th to endDay
3421%43%27%
114
October1st to 15thDay
25%32%46%13%
90
16th to endDay
15%39%38%26%7%
96
November1st to 15thDay
22%318%32%18%4
90
16th to endDay
25%10%20%27%8%7%
90
December1st to 15thDay
41%218%15%12%10%
90
16th to endDay
33%11%38%9%5%2
96
January1st to 15thNight
23%7%25%32%11%
900
16th to endNight
19%7%28%35%9%
905
February1st to 15thNight
19%9%27%35%7%
704
16th to endNight
19%10%33%30%6%
593
March1st to 15thNight
21%7%28%34%7%
540
16th to endNight
15%7%31%37%8%
576
April1st to 15thNight
17%5%36%32%8%
539
16th to endNight
21%6%32%29%9%
540
May1st to 15thNight
13%5%34%37%8%
540
16th to endNight
8%325%42%19%
563
June1st to 15thNight
5%111%48%31%1
540
16th to endNight
6%112%39%36%4
540
July1st to 15thNight
37%34%48%5%
510
16th to endNight
2331%51%9%
564
August1st to 15thNight
1131%57%8%
539
16th to endNight
8%125%52%10%
573
September1st to 15thNight
7%322%55%10%
540
16th to endNight
9%6%28%45%8%
519
October1st to 15thNight
6%29%36%41%3
531
16th to endNight
8%317%41%26%2
704
November1st to 15thNight
13%220%36%24%2
700
16th to endNight
14%424%34%20%1
822
December1st to 15thNight
23%6%24%29%14%1
900
16th to endNight
21%9%25%30%12%
960
Page generated at 2017-09-25 08:02:16. Version ac04

Copyright 2017 A. Danko


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